Atheism music
Lists of atheist, skeptic and rationalist songs & musicians
Alabama Atheist's Music, a selection of songs about Atheism, agnosticism, religious doubt and ridicule
Atheist Playlist, compiled by Kids Without God
'Satan Is Real' Atheist Music Blog, a huge list of songs related to atheism, rationalism & science
Wikipedia's List of atheists in music
Musicians and groups who explicitly support atheism, skepticism and rationalism
Parkway Drive atheistic metal-core from down under
Bad Religion, punk rocking since 30 years and counting
DJ Madson (Brian Flemming), The God Who Wasn't There's film & soundtrack
Graydon Square
George Hrab
G.A. (Gifted Anomaly)
Irreverend James and the Critical Mass Choir, godless gospel
Shelley Segal on Souncloud
Drew Stedman on Facebook
Stigmath on Soundcloud and facebook
Symphony of Science
Tombstone Da Deadman (temporarily down 2013.02.18) is a skeptical rapper on Youtube, Reverbnation & Facebook
Specific songs of note (Anthems)
Faithless, by Rush